Shirt collar



FIG. 1 is a front perspective view of a shirt collar showing my new design;

FIG. 2 is a rear elevational view thereof; and,

FIG. 3 is a top plan view of the shirt collar that is laid flat.

The broken line showing of a shirt FIGS. 1 and 2 is included for the purpose of showing the environment of the shirt collar and forms no part of the claimed design.

The dashed lines shown on the shirt collar represent conventional stitching. 

The ornamental design for a shirt collar, as shown and described. 